Another toilet flange question

Hi,
I have removed our old 1930's toilet and discovered that the flooring and the 4" cast iron pipe are connected by a lead sheet collar. I am thinking to install an Oatey twist and set flange and bolt it to the flooring. Is this right? How can I ensure a good seal to the pipe which does not have a smooth surface? What is best: cast iron flange, abs flange, ss covered flange?

None of those are approved or reliable in this situation. If the lead is intact, a plumber can lead on a new brass or bronze flange. If it's not, then it gets much more involved - the lead needs to be removed. Then, you have the choice of using whatever material you wish, pvc, abs, cast iron, or even copper to rebuild the pipe and install a new flange. There are no friction or expansion flanges designed to work inside a lead sleeve.

None of those are approved or reliable in this situation. If the lead is intact, a plumber can lead on a new brass or bronze flange. If it's not, then it gets much more involved - the lead needs to be removed. Then, you have the choice of using whatever material you wish, pvc, abs, cast iron, or even copper to rebuild the pipe and install a new flange. There are no friction or expansion flanges designed to work inside a lead sleeve.

Click to expand...

Its not easily seen, but the lead only goes down about an inch to where the iron pipe starts. I was thinking the flange extensions would fit against the iron.